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Clinical Chemistry 44: 1381-1387, 1998;
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(Clinical Chemistry. 1998;44:1381-1387.)
© 1998 American Association for Clinical Chemistry, Inc.

Molecular Diagnostics and Genetics

Optimized PCR labeling in mutational and microsatellite analysis

Diana Liberata Esposito, Raffaele Palmirotta, Maria Concetta Verì, Sandra Mammarella, Franca D'Amico, Maria Cristina Curia, Gitana Aceto, Stefania Crognale, Beatrice Creati, Renato Mariani-Costantini, Pasquale Battista, and Alessandro Camaa

Department of Oncology and Neurosciences, Faculty of Medicine, University "Gabriele D'Annunzio", Via dei Vestini 1, 66013 Chieti, Italy.
a Author for correspondence. Fax 39-871-3555-4110; e-mail Cama{at}unich.it.

To optimize the labeling and visualization of PCR products we tested different variables, including deoxynucleotide concentration and ratio, dilution of labeled product, number of PCR cycles, and use of one-step or nested labeling protocols. Labeling was achieved using a fixed amount of labeled dATP, whose relative specific activity was varied by adding increasing amounts of cold dATP. Optimal PCR-labeling intensity was reached at dATP concentrations between 0.9 and 7.0 µmol/L, with a peak at 1.8 µmol/L. This concentration corresponded to an optimal ratio between the increase in specific activity and the decrease in DNA yield. Nucleotide imbalances >1:2 were not advantageous. Mutational analysis by single-strand conformational polymorphism (SSCP) was used to validate PCR-labeling protocols. The limiting nucleotide concentrations did not affect SSCP. Clear SSCP patterns were obtained using DNA templates of different sizes derived from several genes. SSCP patterns obtained using one-step or nested PCR-labeling protocols were equivalent and were visualized after overnight exposure, using [{alpha}35S]dATP as the label. Dilutions of labeled products ranging between 1:10 and 1:2.5 influenced SSCP patterns, and the lowest dilution tested produced better-defined and more-intense signals. Optimized SSCP conditions allowed the detection of novel and previously characterized nucleotide variants. Clear microsatellite typing was also obtained using optimized protocols and [{alpha}35S]dATP as the label.




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